Has an AFL game ever ended 71-29?
Exactly once. On September 30, 1933, Sydney beat Richmond 71-29, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 71-29 in league history.
That makes 71-29 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 72-29 has happened 1 times and 71-30 has happened 1 times.